What are msipatchregfix... files in Microsoft Update Catalog?

A

AntS70

On the Microsoft Update Catalog website, when I choose an update to download, the site often offers me an extra .exe file to download with a name beginning msipatchregfix. One website indicates it's a "Patch Registration Clean up Utility". To see an example, click on any of the download buttons for this update.

Microsoft Update Catalog

Could someone tell me what these msipatchregfix... files do, whether I should download and run them, too, and if so, how to run them—they seem to require a product code as an argument? Do they offer any additional benefit compared to when installing via Windows' Automatic Updates?

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